JP6695095B2 - Drilling stirrer - Google Patents

Description

  The present invention relates to an excavating and agitating device for excavating the ground to agitate and mix excavated soil and a hardened material to form an underground pile in which the excavated soil is solidified with the hardened material.

  Conventionally, for the purpose of improving soft ground, the soil excavated from the ground and a hardening material such as cement are stirred and mixed in the ground, and the solidified excavated soil is used as an underground pile or a ground pile is provided in a row. An excavation and agitation device for forming an inner wall is known (see Patent Documents 1 and 2).

  The excavating and agitating device disclosed in Patent Document 1 and Cited Document 2 includes an excavating blade provided at the tip of the hollow shaft and a stirring blade provided slightly above the excavating blade. While excavating the soil by horizontally rotating the excavation blade with the rotation of, the earth and sand excavated and the hardened material such as cement milk discharged from the tip of the hollow shaft is stirred and mixed in the ground by the stirring blade, The excavated earth and sand are solidified with a hardening material to form underground piles.

  By the way, in the improvement of soft ground, there are cases where a plurality of underground piles are arranged in a row to form an underground wall for the purpose of strengthening the soil or stopping water. When constructing such an underground wall, it is desirable to construct adjacent underground piles as close as possible to each other so that the gap between them is small, and to further minimize the gap between them. It is desirable that each underground pile should be formed in a square shape and the contact area with the adjacent underground pile should be large. However, in the excavation and agitation device disclosed in Patent Documents 1 and 2, the agitating blade has a structure capable of rotating around the hollow shaft, and the agitating blade mixes and mixes the earth and sand and the hardening material. At this time, the stirring blade rotates while stirring around the hollow shaft, so that the shape of the solidified underground pile also becomes circular, like the shape of the drill hole.

JP-A-8-13473 Japanese Examined Patent Publication No. 63-38496

  The problem to be solved by the present invention is to excavate a rectangular excavation hole in the ground and to agitate and mix excavated earth and sand with a hardened material to form an underground pile piled into a rectangular shape to excavate and agitate. To provide.

In order to solve the above-mentioned problems, the excavating and stirring apparatus according to the present invention is provided with a rotating rod, a horizontal excavating unit that is provided at the tip of the rotating rod, and rotates horizontally with the rotating rod, and above the horizontal excavating unit. A vertical excavation unit arranged, and a mechanical element for transmitting the rotation of the rotating rod to give a vertical rotational force to the vertical excavation unit,
The vertical excavation part is rotatably supported by a fixed member separated from the rotation of the rotary rod, the mechanical element is a main bevel gear fixed to the rotary rod, and the main bevel gear meshes with the main bevel gear. A sub-bevel gear that rotates with the rotation of the sub-bevel gear, and a rotary shaft of a vertical excavation unit connected to the sub-bevel gear is rotatably supported by the fixed member and is a tip portion rotatably supported by the arranged a center collar during rotation rod,
The fixing member includes a protective case that is integrally fixed to a guide rod that covers the outer periphery of the rotating rod and is separated from the rotation of the rotating rod, and the rotating shaft is rotatable to the protective case via a radial bearing. In addition to being supported by the center collar, the tip of the rotary shaft is rotatably supported by the center collar via a radial bearing arranged between the tip of the rotary shaft and the center collar .

  Further, in one embodiment of the present invention, the mechanical element is a pair of main bevel gears fixed to the rotating rod, and a pair of sub-bevels that mesh with the main bevel gear and rotate with the rotation of the main bevel gear. A thrust bearing is provided between at least one of the pair of main bevel gears and the rotating rod.

  Further, in an embodiment of the present invention, the vertical excavation unit includes a plurality of vertical rotary blades and a second excavating blade attached to the plurality of vertical rotary blades, and at least the second excavating blade has the vertical rotary blade. The blade is mounted at a predetermined tilt angle with respect to a vertical plane as the blade rotates in the vertical direction.

  The excavation and agitation apparatus according to the present invention includes a mechanical element that transmits the rotation of the rotating rod to give a vertical rotating force to the vertical excavating portion, and the vertical excavating portion is separated from the rotation of the rotating rod. Since it is rotatably supported by the fixed member, the vertical excavation part rotates only in the vertical direction without rotating around the rotating rod, and thus the rectangular excavation hole and the square underground pile corresponding to this hole shape. And can be created.

  Further, in the excavation and agitation device according to the present invention, a bevel gear is used as a mechanical element that transmits the rotation of the rotary rod to give a vertical rotational force to the vertical excavation portion, and a pair of main gears of the bevel gear are used. Since the thrust bearing is provided between at least one of the bevel gears and the rotating rod, the thrust bearing receives the force acting in the axial direction of the rotating rod at the time of excavation, and the lower main bevel gear flexibly. Since it can move, it is possible to avoid a rotational trouble due to the meshing of the main bevel gear and the sub-bevel gear of the bevel gear.

  Further, in the excavating and stirring device according to the present invention, the second excavating blade attached to the vertical rotor is attached at a predetermined inclination angle with respect to a vertical plane when the vertical rotor rotates in the vertical direction. As a result, the inner peripheral wall of the circular hole excavated by the horizontal excavating part is scraped off by the inclined second excavating blade so that four corners are formed on the circular inner peripheral wall. It is possible to form a square hole consisting of

It is a whole figure showing the use state of the excavation stirring device concerning the present invention. It is a front view showing the important section of the excavation stirring device concerning one embodiment of the present invention. It is a conceptual diagram which shows the power conversion part of the excavation stirring device which concerns on one Embodiment of this invention. It is a perspective view of the important section of the excavation stirring device concerning one embodiment of the present invention. It is explanatory drawing which shows the outline of the excavation hole excavated by the horizontal rotary blade and vertical rotary blade of the excavation stirring device which concerns on one Embodiment of this invention.

  Hereinafter, an excavation stirring device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. As shown in FIG. 1, in the excavation and agitation device 1 according to this embodiment, a high support column 4 is vertically installed at the tip of a base machine 3 that can be moved by a caterpillar 2, and an auger motor 5 slides vertically on the support column 4. It is possible to install. A rod 6 of the excavation stirring device 1 is attached to the auger motor 5, and a horizontal excavation portion 7 and a vertical excavation portion 8 are provided below the rod 6.

  As shown in FIG. 1, the rod 6 of the excavation and agitation device 1 covers a rotary rod 9 connected to the auger motor 5 via a reduction gear (not shown) and the outer periphery of the rotary rod 9. It consists of a guide rod 10. The guide rod 10 has its upper end fixed to the casing of the auger motor 5 and has its lower end near the lower end slidably held by a holder 11 for vibration isolation extending from the support column 4 to prevent the rotation of the rotating rod 9. It has been separated. As shown in FIG. 2, a hollow portion 12 is formed throughout the inside of the rotary rod 9, and a soil hardening material such as cement milk is supplied to the excavation hole through the hollow portion 12. ..

  A horizontal excavation part 7 is provided at the lower end of the rod 6. As shown in FIGS. 2 and 4, the horizontal excavation unit 7 includes a pair of horizontal rotary blades 13 that horizontally rotate at the tip of the rotary rod 9 and a longitudinal direction of the horizontal rotary blades 13. And a plurality of first drilling blades 14 attached. The horizontal rotary blade 13 is formed by protruding a rib 13b on the lower surface of an elongated flat plate 13a, and its base is fixed to a handle 13c serving as a rotation center.

  From the handle portion 13c, a pair of horizontal rotary blades 13 extend horizontally in two opposite directions, and three first excavating blades 14 are detachably attached to the ribs 13b of each horizontal rotary blade 13. Has been done. Each of the first excavating blades 14 has a flat blade 14a having a sharp edge, and the flat blade 14a is mounted so as to be parallel to the longitudinal direction of the horizontal rotary blade 13. Each 1st excavation blade 14 rotates together with the horizontal rotation of the horizontal rotary blade 13, and the bottom face of an excavation hole is excavated circularly by the plane blade 14a. In addition, in this embodiment, the case where the three first digging blades 14 are attached to the horizontal rotary blade 13 is described, but the number of the first digging blades 14 is not limited to three, and Since the length of the horizontal rotary blade 13 also changes according to the size of the drilled hole, the number of the first drilling blades 14 also changes accordingly.

  A vertical excavation section 8 is arranged slightly above the horizontal excavation section 7. As shown in FIGS. 2 and 4, the vertical excavation unit 8 is arranged on both left and right sides of the rod 6 and has a vertical rotary blade 15 that rotates in the vertical direction and a vertical rotary blade 15 in the longitudinal direction. And a plurality of second cutting blades 16 mounted along the same. The vertical rotary blade 15 has four elongated rectangular flat plates 15b extending in a cross shape from the shaft portion 15a which is the center of rotation, and one long side 15c of the flat plate 15b (in the direction in which the vertical rotary blade rotates). On the front side), three second excavating blades 16 are detachably attached. Note that, as shown in FIG. 2, the vertical rotor 15 is arranged substantially above the tip of the horizontal rotor 13.

  Each of the second excavating blades 16 has a flat blade 16a with a sharp edge, like the first excavating blade 14, but unlike the mounting of the first excavating blade 14, the flat blade 16a is different. Are mounted so as to be orthogonal to the longitudinal direction of the vertical rotor 15. Therefore, by rotating together with the vertical rotary blades 15 in the vertical direction, the side surface of the hole excavated by the horizontal excavating unit 7 is linearly excavated by the plane blade 16a of the second excavating blade 16. can do.

  Further, in this embodiment, the handle is provided in a state where the four vertical rotors 15 are alternately tilted inward and outward by a predetermined angle with respect to a vertical plane 17 when the vertical rotors 15 rotate in the vertical direction. It is attached to the portion 15a. That is, as shown in FIG. 4, among the four vertical rotors 15, one pair of vertical rotors 15d facing each other inclines inward with respect to the rotation direction, and the other pair of vertical rotors 15 facing each other. 15e is inclined outward. Further, in this embodiment, since the second excavating blade 16 is mounted on the flat plate 15b of the vertical rotary blade 15 in a state of being extended straight, the second excavating blade 16 is also flat at the same angle as the vertical rotary blade 15. It will be inclined with respect to 17. As described above, since the second excavating blade 16 is attached to the plane 17 in a state of being inclined inward and outward, it is possible to more reliably excavate the rectangular excavating hole.

  In addition, in this embodiment, since the second excavating blade 16 is attached to the flat plate 15b of the vertical rotary blade 15 in a state of being extended straight, the vertical rotary blade 15 and the second excavating blade 16 have the same inclination angle. However, the vertical rotor 15 may be attached to the handle 15a so as to be parallel to the plane 17, and at least only the second excavating blade 16 may be inclined with respect to the plane 17. Further, the number of the second excavating blades 16 mounted on one vertical rotary blade 15 is not limited to three, as in the case of the first excavating blades 14.

  In the vicinity of the vertical excavation unit 8, a power conversion unit 20 is provided that transmits the rotation of the rotating rod 9 in the horizontal direction to the rotation in the vertical direction to impart a vertical rotational force to the vertical excavation unit 8. ing. The power conversion unit 20 includes a mechanical element 21 for transmitting the power and a protective case 22 that covers the mechanical element 21. In this embodiment, a bevel gear is used as the mechanical element 21. As shown in FIGS. 2 and 3, the bevel gear has a pair of upper and lower main bevel gears 23 and 24 attached to the rotating rod 9 and a rotation of the main bevel gear that meshes with the main bevel gears 23 and 24. And a pair of left and right sub-bevel gears 25 and 26 that rotate in accordance with the above. The pair of main bevel gears 23, 24 rotates integrally with the rotating rod 9 by being attached to the rotating rod 9. In particular, in this embodiment, the upper main bevel gear 23 is fixed to the rotating rod 9, while the lower side The main bevel gear 24 has an oil-impregnated bearing 27 a and a thrust bearing 28 arranged between the main bevel gear 24 and the main shaft 24, so that the main rod gear 24 is cut off from the rotary rod 9. Therefore, the force acting in the axial direction of the rotating rod 9 during excavation is received by the thrust bearing 28, and the lower main bevel gear 24 can move flexibly, so that the main bevel gears 23, 24 and the sub-bevel gears 25, 26 of the bevel gears can be moved. Rotation trouble due to the meshing of can be avoided. The same effect can be obtained even if the mechanism by the thrust bearing is provided on the upper main gear 23 side.

  On the other hand, the pair of secondary bevel gears 25, 26 arranged on the left and right sides of the pair of main bevel gears 23, 24 are arranged so as to mesh with the main bevel gears 23, 24, and at the same time, of the vertical rotary blade 15. It is integrally fixed to the rotary shaft 29. As shown in FIG. 3, the rotary shaft 29 is rotatably supported by the protective case 22 of the power conversion unit 20 via a radial bearing 30. Further, an oil-impregnated bearing 27b and a center collar 31 similar to those described above are arranged between the tip of the rotary shaft 29 and the rotary rod 9, and between the center collar 31 and the tip of the rotary shaft 29. Is provided with a radial bearing 32 to ensure smooth rotation of the rotary shaft 29.

  As shown in FIGS. 2 to 4, the protective case 22 that covers the bevel gear has a tubular shape with a substantially square cross section, and the mounting flange 35 at the upper end is the mounting flange 36 of the guide rod 10. It is fixed to the guide rod 10 integrally by being fixed to the guide rod 10 by a bolt 37. Further, as shown in FIG. 2, the lower portion 22a of the protective case 22 is formed in a slightly tapered shape, and leakage of oil filled in the protective case 22 due to an oil seal mounted between the protective case 22 and the rotary rod 9. Is preventing. Further, an arm portion 38 for supporting the rotary shaft 29 of the vertical rotary blade 15 projects leftward and rightward in the central portion of the protective case 22. As described above, the arm portion 38 incorporates the radial bearing 30 that rotatably supports the rotating shaft 29, and has the insertion hole 39 of the rotating shaft 29 at the tip thereof.

  Next, the operation of the excavation and agitation device 1 having the above configuration will be described. After the excavation stirrer 1 is carried to the excavation site by the base machine 3 and set, the auger motor 5 is driven to rotate the rotary rod 9. The rotation of the rotary rod 9 causes the horizontal rotary blade 13 of the horizontal excavation unit 7 to rotate in the horizontal direction, and the first excavating blade 14 attached to the horizontal rotary blade 13 excavates the soft ground. Further, the upper main bevel gear 23 of the bevel gear fixed to the rotating rod 9 and the lower main bevel gear 24 supported by the oil-impregnated bearing 27a on the rotating rod 9 rotate together with the rotating rod 9, The rotational force is transmitted to the sub-bevel gears 25 and 26. The rotating shaft 29 supported by the protective case 22 is rotated by the rotation of the sub-bevel gears 25 and 26, and the vertical rotor blades 15 of the vertical excavating unit 8 attached to the tip of the rotating shaft 29 are rotated in the vertical direction. At this time, the left and right vertical rotors 15 rotate in opposite directions. Since the rotating shaft 29 of the sub-bevel gears 25 and 26 is rotatably supported by the protective case 22, the sub-bevel gears 25 and 26 do not revolve around the main bevel gears 23 and 24 but rotate at a fixed position. .. Therefore, the vertical rotor blades 15 only rotate in the vertical direction, and do not horizontally rotate around the rod 6.

  The second excavating blade 16 mounted on the vertical rotor 15 has an inner peripheral wall of a circular hole excavated by the first excavating blade 14 of the horizontal rotor 13 as the vertical rotor 15 rotates in the vertical direction. Excavate as if scraping away. FIG. 5 is a schematic diagram showing the outer shape of the circular hole 40 excavated by the first excavating blade 14 and the outer shape of the square hole 41 excavated by the second excavating blade 16. First, the circular hole 40 is excavated in the ground by the first excavating blade 14 to a predetermined depth. At this time, the left and right vertical rotary blades 15 rotate in the vertical direction to dig into the left and right inner peripheral walls of the circular hole 40 so that the four side walls 42a, 42b, 42c, and 42d are substantially flat. The square hole 41 can be formed. Of the four side walls, only the two side walls 42a, 42b facing each other are directly scraped off by the second excavating blade 16 of the vertical rotor 15, while the remaining two side walls 42c, 42d facing each other are not directly scraped off. As described above, since the second digging blades 16 are alternately inclined to the outside and the inside, the second digging blades 16b attached to the tip of the vertical rotor 15 and inclined to the inside are inclined to the outside. The second excavating blade 16c forms the four corners 44 on the inner peripheral wall of the circular hole 40 by scraping off the wall soil 43 at the four opposite positions on the inner peripheral wall of the circular hole 40 so as to be rolled up. As a result, not only the side walls 42a and 42b directly excavated by the vertical rotor 15 but also the side walls 42c and 42d on the side not directly excavated by the vertical rotor 15 become substantially flat wall surfaces, and as a result, A square hole 41 having four flat side walls 42a, 42b, 42c, 42d will be formed.

  After the rectangular hole 41 is excavated to a predetermined depth by the horizontal excavation unit 7 and the vertical excavation unit 8 as described above, the auger motor 5 is slid upward along the support column 4. At this time, by continuing the rotation of the rotary rod 9 as it is, the horizontal rotary blade 13 and the vertical rotary blade 15 can be pulled up while rotating. In conjunction with this pulling up operation, cement milk as a hardening material is supplied through the hollow portion 12 of the rotary rod 9. In the excavation hole, the cement milk supplied from the discharge port 9a provided at the tip of the rotary rod 9 and the excavated earth and sand are stirred and mixed in the excavation hole to be solidified to form a square underground pile. Stirring and mixing of the cement milk and the earth and sand are performed by the horizontal rotary blade 13 of the horizontal excavation unit 7 and the vertical rotary blade 15 of the vertical excavation unit 8. In this embodiment, the flat plate 15b of the vertical rotary blade 15 is Since the vertical rotor 15 is inclined with respect to the vertical plane 17 when rotating, the stirring and mixing of the cement milk and the excavated earth and sand is more sufficiently performed, and at the same time the vertical rotor 15 rotates. When climbing, the inclined flat plate 15b solidifies the side walls 42a, 42b, 42c, 42d of the excavation hole while adjusting the shapes thereof, so that a quadrangular pillar underground pile is formed.

  Although the preferred embodiments of the present invention have been described above, it should be appreciated that the present invention is not limited to these embodiments and that various modifications and changes can be made to these embodiments.

DESCRIPTION OF SYMBOLS 1 Excavator and agitator 2 Caterpillar 3 Base machine 4 Strut 5 Auger motor 6 Rod 7 Horizontal excavation part 8 Vertical excavation part 9 Rotating rod 9a Discharge port 10 Guide rod 11 Holder 12 Hollow part 13 Horizontal rotating blade 13a Flat plate 13b Rib 13c Handle part 14th 1 Excavation Blade 14a Plane Blade 15 Vertical Rotating Blade 15a Handle 15b Flat Plate 15c Long Side 16 Second Excavation Blade 16a Flat Blade 16b Outside 16c Inside 17 Vertical Plane 20 Power Converter 21 Machine Element 22 Protective Case 22a Lower 23,24 Main Bevel gears 25, 26 Secondary bevel gears 27a, 27b Oil-impregnated bearings 28 Thrust bearings 29 Rotating shafts 30, 32 Radial bearings 31 Center collars 35, 36 Mounting flanges 37 Bolts 38 Arms 39 Insert holes 40 Circular holes 41 Square holes 42 Side walls 43 Wall clay 44 corner

Claims (8)

A rotating rod,
A horizontal excavation unit that is provided at the tip of the rotating rod and rotates in the horizontal direction together with the rotating rod,
A vertical excavation section arranged above the horizontal excavation section,
A mechanical element for transmitting the rotation of the rotating rod to give a vertical rotating force to the vertical excavation unit,
The vertical excavation unit is rotatably supported by a fixed member separated from the rotation of the rotating rod,
The mechanical element comprises a main bevel gear fixed to the rotating rod, and a bevel gear provided with a sub-bevel gear that meshes with the main bevel gear and rotates with the rotation of the main bevel gear,
A rotary shaft of a vertical excavation unit connected to the sub-bevel gear is rotatably supported by the fixed member, and rotatably supported by a center collar arranged between a tip end of the rotary shaft and a rotary rod. ,
The fixing member includes a protective case that is integrally fixed to a guide rod that covers the outer periphery of the rotating rod and is separated from the rotation of the rotating rod .
The rotary shaft is rotatably supported by a protective case via a radial bearing, and the tip end of the rotary shaft is centered via a radial bearing arranged between the tip end of the rotary shaft and the center collar. An excavator and agitator that is rotatably supported by a collar .   The bevel gear includes a pair of main bevel gears that are vertically arranged so as to face each other, and a pair of left and right sub-bevel gears that are disposed between the pair of main bevel gears, and the pair of main bevel gears. The excavation stirring device according to claim 1, wherein a thrust bearing is provided between at least one of the main bevel gears and the rotary rod.   The excavating and stirring apparatus according to claim 1, wherein a hollow portion is provided inside the rotary rod, and a discharge port of a hardening material supplied through the hollow portion is provided at a tip end portion of the rotary rod.   The vertical excavation unit includes a plurality of vertical rotors and a second excavating blade attached to the plurality of vertical rotors, and at least the second excavating blade is vertical when the vertical rotors rotate in a vertical direction. The excavating and stirring apparatus according to claim 1, wherein the excavating and stirring apparatus is attached at a predetermined inclination angle with respect to a flat plane. The second excavating blades attached to the plurality of vertical rotor blades are arranged such that, in adjacent vertical rotor blades, one second rotor blade is attached to one vertical rotor blade at an inclination angle outward with respect to the vertical plane, and another vertical rotor blade. The excavating and stirring device according to claim 4 , wherein the excavator is attached to the vertical plane at an inclining angle with respect to the vertical plane.   The vertical excavation unit includes a plurality of flat plate-shaped vertical rotary blades and a second drilling blade attached to the flat plate-shaped vertical rotary blades. The excavating and stirring apparatus according to claim 1, wherein the vertical rotary blade is attached at a predetermined inclination angle with respect to a vertical plane when the vertical rotary blade rotates in the vertical direction. Of the pair of main bevel gears arranged above and below, the upper main bevel gear is fixed to the rotating rod, while the oil-impregnated bearing and the thrust bearing are arranged between the lower main bevel gear and the rotating rod. The excavation and agitation device according to claim 2 . The excavation stirring device according to claim 1 , wherein a lower portion of the protective case is formed in a slightly tapered shape, and an oil seal is mounted between the lower portion of the protective case and the rotating rod.

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